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Old 10-29-2017, 06:42 PM   #1
'02SilverSL1
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Default 2002 SL1 Rough Idle when in Gear and Stopped

I've been experiencing a rough idle, fluctuating between 500-600RPM, when I'm stopped at a traffic light or just stuck in the bank drive thru. When I put the car in park, the engine revs up to a constant 1100 RPM with no roughness at all. I get two codes. P0446-Evaporative Emission Vent System Performance and P0507 - Idle Speed High. The dealer performed a vacuum smoke test and found no leaks. I also replaced the gas cap and IAC valve, and cleaned the throttle body. Any suggestions on what I can try next?

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Old 10-30-2017, 12:05 PM   #2
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2001 SL1
Default Re: 2002 SL1 Rough Idle when in Gear and Stopped

OK, so when you cleaned the throttle body and replaced the IAC, did you clean/replace the TPS since you had it all opened up, and did you get all gaskets back in correctly at reassembly?

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Old 10-31-2017, 01:14 PM   #3
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Default Re: 2002 SL1 Rough Idle when in Gear and Stopped

I did replace the TPS also. And yes, all the gaskets were properly seated with no folds when I reassembled everything.

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